What are optional arguments in JavaScript Functions?

Javascript Web Development Front End Technology

To declare optional function parameters in JavaScript, use the “default” arguments.

Example

You can try to run the following code to declare optional parameters −

<html>
   <body>
      <script>
         // default is set to 1
         function inc(val1, inc = 1) {
            return val1 + inc;
         }
         document.write(inc(10,10));
         document.write("<br>");
         document.write(inc(10));
      </script>
   </body>
</html>

Daniol Thomas

Published on 23-Feb-2018 10:44:57

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